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Editorial Team
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Asked: 2026-05-29T09:28:31+00:00

I was thinking to implement fetching of data with ajax request on click of

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I was thinking to implement fetching of data with ajax request on click of a link. I know how to work with $.ajax and other xhr request methods. I wanted to know some infromation on the following case. I went to http://www.facebook.com/?sk=welcome
and then I clicked “Find Friends” I noticed the url changed to http://www.facebook.com/?sk=ff and the data in the right hand side was refreshed(without postback) and my friends were loaded. The strange thing I noticed was that no XHR request was logged (I was looking with FireBug console) which I expected to be. How does FB do that with any XHR request? Does FB uses Iframe for it, if not, then how does it refreshes a section of page with fresh data without postback without some XHR request (in this case).

How client can call server’s data without postback, without iframe and without some ajax call?

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1 Answer

  1. Editorial Team

    Facebook uses invisible iFrames.

    Here’s the content of one of them:

    <html>
<head>
<title></title>
</head>
<body>
<span id="fbEmuTrackingSuccess">Success</span>
</body>
</html>

    The source is a URL full of params. So I guess it’s sending all its Ajax requests by changing the iframe URL, performing the callback when the iFrame is loaded, based on the content of the iFrame’s body.

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